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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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There are 60,000 miles of blood vessels in every adult human.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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